What are some common mistakes when using module patterns in JavaScript?

What are some common mistakes when using module patterns in JavaScript?

Some common mistakes include not properly encapsulating variables, creating unnecessary global variables, and failing to return the public API.

Can you explain how to properly encapsulate variables?

To encapsulate variables, you should define them within the module function and only expose what is necessary through the returned object.

What about using closures? Are there mistakes related to that?

Yes, a common mistake is not understanding how closures work, which can lead to unexpected behavior, especially with asynchronous code.

How can I avoid creating unnecessary global variables?

You can avoid unnecessary globals by keeping your module self-contained and using IIFE (Immediately Invoked Function Expressions) to create a local scope.

Can you give an example of a well-structured module pattern?

Sure! A well-structured module pattern might look like this:

const MyModule = (function() {
    let privateVar = 'I am private';
    return {
        publicMethod: function() {
            console.log(privateVar);
        }
    };
})();